<template>
  <div class="manyAreaSelect">
    <div class="item">
      <div class="item-title">
        <span> 选择省</span>
      </div>
      <div class="item-content">
        <ul>
          <li v-for="(item,index) in chinaArea" :class="item.selected?'active':''" :key="index" @click="getCityList(item)">{{item.regionName}}</li>
        </ul>
      </div>
      <div class="item-footer"></div>
    </div>
    <div class="item">
      <div class="item-title">
        <span>选择市</span>
      </div>
      <div class="item-content">
        <ul v-show="cityList.length===0">
          <li>
            &lt;&lt;请选择省份
          </li>
        </ul>
        <ul v-show="!notLimitButton.notLimitCity &&cityList.length!==0">
          <li v-for="(item,index) in cityList" :class="item.selected ? 'active':''" :key="index" @click="getDistricList(item)">{{item.regionName}}</li>
        </ul>
      </div>
      <div class="item-footer">
        <button type="button" class="button" :class="notLimitButton.notLimitCity?'success':''" @click="cityNotLitmit({regionName:'不限',regionId:'0'})"  :disabled="!selectItem.province.regionName">不限城市</button>
      </div>
    </div>
    <div class="item">
      <div class="item-title">
        <span>选择地区</span>
      </div>
      <div class="item-content">
        <ul v-show="districList.length===0">
          <li>
            &lt;&lt;请选择城市</li>
        </ul>
        <ul v-show="!notLimitButton.notLimitCity && !notLimitButton.notLimitDistrict && districList.length!==0">
          <li v-for="(item,index) in districList" :class="item.selected?'active':''" :key="index" @click="getAreaCombineID(item)">{{item.regionName}}</li>
        </ul>
      </div>
      <div class="item-footer">
        <button type="button" class="button" :class="notLimitButton.notLimitDistrict ?'success':''" @click="districNotLitmit({regionName:'不限',regionId:'0'})" :disabled="!selectItem.city.regionName ||!selectItem.province.regionName || notLimitButton.notLimitCity ">不限地区</button>
      </div>
    </div>
    <div class="trangle">
      <div class="trangle-wrap">
        <div class="left">
          <button type="button" class="button" @click="transferToRight" :disabled="direactionStatusToRight">
            <svg-icon :icon-class="this.iconDirection.right"></svg-icon>
          </button>
        </div>
        <div class="right">
          <button type="button" class="button" @click="transferToLeft" :disabled="direactionStatusToLeft">
            <svg-icon :icon-class="this.iconDirection.left"></svg-icon>
          </button>
        </div>
      </div>
    </div>
    <div class=" item ">
      <div class="item-title ">
        <span>已选位置</span>
      </div>
      <div class="item-content ">
        <ul class="selectedContent">
          <li v-for="(item,index) in selectedList" :class="item.selected?'active':''" :key="index" @click="selectedAreaSingle(item)">{{item.regionName}}</li>
        </ul>
      </div>
      <div class="item-footer">
        <button type="button" class="button" @click="selectedAllArea()" :disabled="rightDataList.length=== 0" :class="selectedAllButtonStatus?'success':''">{{selectedAllButtonStatus?'反选':'全部'}}</button>
      </div>
    </div>
  </div>
</template>

<script>
/**
 * 用法：
 * <!--selectedData就是响应的数据.sync是2.3回归的语法糖-->
 * <!--可以绑定iconDirection传入箭头的iconfont,Object-->
 * <many-area-select :selectedData.sync="manyAreaValue"></many-area-select>
 * https://github.com/lisiyizu/vue-ztree-2.0
 * 本文来自 crper 的CSDN 博客 ，全文地址请点击：https://blog.csdn.net/crper/article/details/77435396
 */
import _ from 'lodash'
import chinaArea from './area.json'
// import chinaArea from '../../../static/json/area.json'
export default {
  name: 'manyAreaSelect',
  data: function() {
    return {
      chinaArea, // 这是地区联动的JSON
      notLimitButton: {
        notLimitCity: false, // 城市不限
        notLimitDistrict: false // 地区不限
      },
      selectedAllButtonStatus: false, // 已选位置列表全部按钮的状态
      selectItem: {
        province: {},
        city: {},
        distric: {}
      },
      cityList: [], // 城市列表
      districList: [], // 区域列表
      rightDataList: [], // 选中项目组合成的渲染列表
      rightData: [], // 选中需要移除的
      leftData: [] // 左边选中的转发
    }
  },
  props: {
    selectedData: {
      type: [String, Object, Array]
    },
    iconDirection: {
      type: Object,
      default: function() {
        // 箭头图标
        return {
          left: 'left',
          right: 'right'
        }
      }
    }
  },
  computed: {
    selectedList() {
      // 已选中列表
      if (this.selectedData && this.selectedData !== '') {
        this.rightDataList = this.selectedData
        return this.rightDataList
      } else {
        return this.rightDataList
      }
    },
    direactionStatusToRight() {
      // 控制可以转移的箭头状态
      if (
        this.notLimitButton.notLimitCity ||
        this.notLimitButton.notLimitDistrict
      ) {
        if (this.notLimitButton.notLimitCity) {
          this.removeAllSelected(this.cityList)
          this.removeAllSelected(this.districList)
          return false
        } else {
          if (this.notLimitButton.notLimitDistrict) {
            this.removeAllSelected(this.districList)
            return false
          }
        }
        return false
      } else {
        if (this.selectItem.distric.regionName) {
          return false
        }
        return true
      }
    },
    direactionStatusToLeft() {
      // 控制可以转移的箭头状态
      if (this.rightData.length === 0) {
        return true
      } else {
        return false
      }
    }
  },
  methods: {
    mapSelect(list, value, type) {
      // 高亮选中
      if (type) {
        return list.map(pitem => {
          if (pitem.regionId === value.regionId) {
            if (value.selected && value.selected === true) {
              this.$delete(pitem, 'selected')
            } else {
              this.$set(pitem, 'selected', true)
            }
          }
        })
      } else {
        return list.map(pitem => {
          if (pitem.regionId === value.regionId) {
            if (value.selected && value.selected === true) {
              this.$delete(pitem, 'selected')
            } else {
              this.$set(pitem, 'selected', true)
            }
          } else {
            this.$delete(pitem, 'selected')
          }
        })
      }
    },
    resetToDefault() {
      this.leftData = [] // 清空需要转移的数组
      this.notLimitButton = {
        // 重置按钮状态
        notLimitCity: false, // 城市不限
        notLimitDistrict: false // 地区不限
      }
      this.selectItem.city = {}
      this.selectItem.distric = {}
      this.removeAllSelected(this.cityList) // 清除选中状态
      this.removeAllSelected(this.districList) // 清除选中状态
      this.cityList = []
      this.districList = []
    },
    getCityList(item) {
      this.resetToDefault()
      if (item) {
        this.cityList = item.child // 获取城市列表
        this.selectItem.province = item // 保存省份对象
        this.mapSelect(this.chinaArea, item) // 高亮选择,单选
      }
    },
    getDistricList(item) {
      this.leftData = [] // 清空需要转移的数组
      this.notLimitButton.notLimitDistrict = false // 重置按钮状态
      this.removeAllSelected(this.districList) // 清除选中状态
      this.selectItem.distric = {}
      this.districList = []
      if (item) {
        this.districList = item.child // 获取区域列表
        this.selectItem.city = item // 保存省份对象
        this.mapSelect(this.cityList, item) // 高亮选择,单选
      }
    },
    getAreaCombineID(item) {
      // 获取组合ID
      // console.log(this.leftData)
      if (item) {
        this.selectItem.distric = item
        this.mapSelect(this.districList, item, 'manySelect') // 区域高亮选择,多选

        this.leftData.push({
          regionName:
            this.selectItem.province.regionName +
            '-' +
            this.selectItem.city.regionName +
            '-' +
            item.regionName,
          regionId:
            this.selectItem.province.regionId +
            '-' +
            this.selectItem.city.regionId +
            '-' +
            item.regionId
        })
        this.leftData = _.uniqBy(this.leftData, 'regionId')
        if (this.leftData.length === this.districList.length) {
          this.leftData = []
          this.selectItem.distric = {}
          this.notLimitButton.notLimitDistrict = true // 转为不限制地区
          this.leftData.push({
            regionName:
              this.selectItem.province.regionName +
              '-' +
              this.selectItem.city.regionName +
              '-不限',
            regionId:
              this.selectItem.province.regionId +
              '-' +
              this.selectItem.city.regionId +
              '-0'
          })
        }
      }
    },
    cityNotLitmit(item) {
      // 城市不限
      this.leftData = [] // 请空数组
      this.selectItem.distric = {}
      this.removeAllSelected(this.districList)
      this.notLimitButton.notLimitCity = !this.notLimitButton.notLimitCity // 不限按钮状态
      this.leftData.push({
        regionName: this.selectItem.province.regionName + '-不限-不限',
        regionId: this.selectItem.province.regionId + '-0-0'
      })
    },
    districNotLitmit(item) {
      // 区域不限
      this.leftData = [] // 请空数组
      this.notLimitButton.notLimitDistrict = !this.notLimitButton
        .notLimitDistrict // 不限按钮状态
      this.leftData.push({
        regionName:
          this.selectItem.province.regionName +
          '-' +
          this.selectItem.city.regionName +
          '-不限',
        regionId:
          this.selectItem.province.regionId +
          '-' +
          this.selectItem.city.regionId +
          '-0'
      })
      if (!this.notLimitButton.notLimitDistrict) {
        this.leftData = []
      }
    },
    transferToRight() {
      // 选中推入到已选中列表区域
      if (this.leftData && this.leftData.length !== 0) {
        if (this.leftData.length === 1) {
          // 长度只有1,那就只有不限城市或者地区了
          const limitId = this.leftData[0].regionId.split('-') // 比对比对,切割成数组
          this.rightDataList.map(item => {
            const id = item.regionId.split('-')
            if (limitId[0] === id[0]) {
              if (limitId[1] === '0') {
                // 不限城市
                this.rightDataList = this.rightDataList.filter(ritem => {
                  const rid = ritem.regionId.split('-')
                  if (limitId[0] !== rid[0]) {
                    return ritem
                  }
                })
              } else {
                if (limitId[2] === '0') {
                  // 不限地区
                  this.rightDataList = this.rightDataList.filter(ritem => {
                    const rid = ritem.regionId.split('-')
                    if (limitId[0] === rid[0] && limitId[1] === rid[1]) {
                      if (ritem[2] === '0') {
                        return ritem
                      }
                    } else {
                      if (limitId[0] !== rid[0] || limitId[1] !== rid[1]) {
                        return ritem
                      }
                    }
                  })
                } else {
                  this.rightDataList = this.rightDataList.filter(ritem => {
                    const rid = ritem.regionId.split('-')
                    if (limitId[0] === rid[0]) {
                      if (limitId[1] === rid[1]) {
                        if (!(rid[2] === '0')) {
                          return ritem
                        }
                      } else {
                        if (!(rid[1] === '0')) {
                          return ritem
                        }
                      }
                    } else {
                      return ritem
                    }
                  })
                }
              }
            }
          })
        } else {
          const limitId = this.leftData[0].regionId.split('-') // 比对比对,切割成数组
          this.rightDataList = this.rightDataList.filter(ritem => {
            const rid = ritem.regionId.split('-')
            if (limitId[0] === rid[0]) {
              if (limitId[1] === rid[1]) {
                if (!(rid[2] === '0')) {
                  return ritem
                }
              } else {
                if (!(rid[1] === '0')) {
                  return ritem
                }
              }
            } else {
              return ritem
            }
          })
        }
        this.leftData.map(item => {
          this.rightDataList.push(item)
        })
        this.rightDataList = _.uniqBy(this.rightDataList, 'regionId')
        this.resetToDefault()
      }
    },
    selectedAreaSingle(item) {
      // 已选择区域单个选择
      if (item) {
        this.rightData = []
        this.mapSelect(this.rightDataList, item, 'manySelect') // 区域高亮选择,多选
        this.rightDataList.map(item => {
          if (item.selected) {
            this.rightData.push(item)
          }
        })
      }
    },
    selectedAllArea() {
      // 已选中区域全选反选
      if (this.selectedAllButtonStatus) {
        this.removeAllSelected(this.rightDataList)
        this.rightData = []
      } else {
        this.rightDataList.map(item => this.$set(item, 'selected', true))
        this.rightData = this.rightDataList
      }
      this.selectedAllButtonStatus = !this.selectedAllButtonStatus
    },
    transferToLeft() {
      // 从已选中列表区域退回待转发区域
      if (this.rightData && this.rightData.length !== 0) {
        this.rightDataList = this.rightDataList.filter(item => {
          if (!item.selected) {
            return item
          }
        })
        this.rightData = []
      }
    },
    removeAllSelected(list) {
      // 清空选中状态
      list.map(item => this.$delete(item, 'selected'))
    }
  },
  watch: {
    rightDataList(newValue, oldValue) {
      // 选择列表的值变动响应外部值的变动
      if (newValue.length !== this.rightData.length) {
        this.selectedAllButtonStatus = false
      } else {
        if (newValue.length === 0) {
          this.selectedAllButtonStatus = false
        } else {
          this.selectedAllButtonStatus = true
        }
      }
      this.$emit('update:selectedData', newValue)
      console.log(JSON.stringify(this.rightDataList))
    }
  }
}
</script>

<style scoped lang="scss">
ul {
  padding: 0;
  margin: 0;
  max-height: 100%;
  overflow-y: auto;
  li {
    cursor: pointer;
    text-align: center;
    padding: 5px;
    &.active,
    &:hover {
      background: #e4e8f1;
      color: #48576a;
    }
  }
}

.manyAreaSelect {
  position: relative;
  z-index: 2005;
  .item {
    border: 1px solid #d1dbe5;
    background: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12), 0 0 6px rgba(0, 0, 0, 0.04);
    display: inline-block;
    vertical-align: middle;
    min-width: 180px;
    box-sizing: border-box;
    position: relative;
    height: 100%;
    min-height: 260px;
    margin: 5px;
  }
  .item-title {
    height: 36px;
    line-height: 36px;
    background: #fbfdff;
    margin: 0;
    border-bottom: 1px solid #d1dbe5;
    box-sizing: border-box;
    color: #1f2d3d;
    text-align: center;
  }
  .trangle {
    background: transparent;
    display: inline-block;
    vertical-align: middle;
    width: 40px;
    box-sizing: border-box;
    height: 100%;
    position: relative;
    .trangle-wrap {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
    }
    .left,
    .right {
      margin: 10px 5px;
    }
  }

  .item-content {
    font-size: 13px;
    height: 190px;
    padding: 8px 2px;
  }
  .item-footer {
    padding: 5px 0;
    height: 40px;
    text-align: center;
  }
}

.selectedContent {
  li {
    text-align: left;
    padding-left: 25px;
  }
}

.button {
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  background: #fff;
  border: 1px solid #c4c4c4;
  color: #1f2d3d;
  margin: 0;
  border-radius: 4px;
  padding: 4px;
  font-size: 12px;
  border-radius: 4px;
  -webkit-appearance: button;
  outline: none;
  &.success {
    background: #42d885;
    border-color: #42d885;
    color: #fff;
  }

  &:disabled {
    color: #bfcbd9;
    cursor: not-allowed;
    background-image: none;
    background-color: #eef1f6;
    border-color: #d1dbe5;
  }
}
</style>
